在Python我们要判断一个文件对当前用户有没有读、写、执行权限，我们通常可以使用os.access函数来实现，比如：
# 判断读权限 os.access(<my file>,os.R_OK) # 判断写权限 os.access(<my file>,os.W_OK) # 判断执行权限 os.access(<my file>,os.X_OK) # 判断读、写、执行权限 os.access(<my file>,os.R_OK | os.W_OK | os.X_OK)
但是如果要判断任意一个指定的用户对某个文件是否有读、写、执行权限，Python中是没有默认实现的，此时我们可以通过下面的代码断来判断
import os
import pwd
import stat
def is_readable(cls,path,user):
user_info = pwd.getpwnam(user)
uid = user_info.pw_uid
gid = user_info.pw_gid
s = os.stat(path)
mode = s[stat.ST_MODE]
return (
((s[stat.ST_UID] == uid) and (mode & stat.S_IRUSR > 0)) or
((s[stat.ST_GID] == gid) and (mode & stat.S_IRGRP > 0)) or
(mode & stat.S_IROTH > 0)
)
def is_writable(cls,user):
user_info = pwd.getpwnam(user)
uid = user_info.pw_uid
gid = user_info.pw_gid
s = os.stat(path)
mode = s[stat.ST_MODE]
return (
((s[stat.ST_UID] == uid) and (mode & stat.S_IWUSR > 0)) or
((s[stat.ST_GID] == gid) and (mode & stat.S_IWGRP > 0)) or
(mode & stat.S_IWOTH > 0)
)
def is_executable(cls,user):
user_info = pwd.getpwnam(user)
uid = user_info.pw_uid
gid = user_info.pw_gid
s = os.stat(path)
mode = s[stat.ST_MODE]
return (
((s[stat.ST_UID] == uid) and (mode & stat.S_IXUSR > 0)) or
((s[stat.ST_GID] == gid) and (mode & stat.S_IXGRP > 0)) or
(mode & stat.S_IXOTH > 0)
)
